How do we know the concept of conscience is true?

The concept of conscience is not merely a philosophical idea but a deeply embedded aspect of human existence. Romans 2:15 states that all people, regardless of their knowledge of God, possess an innate understanding of right and wrong, which serves as a witness to God's moral law. This intrinsic conscience can accuse or excuse behavior, demonstrating its active role in guiding moral decisions. Experience supports this theory — individuals frequently grapple with feelings of guilt or remorse after wrongdoing, indicating that conscience serves as a built-in moral compass. Moreover, historical and cross-cultural observations reveal that despite variances in customs, certain moral principles — such as the wrongness of murder and the value of truth — resonate universally, pointing to a common Designer who instilled these values. Therefore, the existence and function of conscience testify to the reality of God's moral law.